| Yellow | VS Club | Date | Sections | |
|---|---|---|---|---|
| 6 | Benfica | 29-08-2018 | Play-Off Round | Match details |
| 3 | Benfica | 21-08-2018 | Play-Off Round | Match details |
| 3 | Spartak Moscow | 14-08-2018 | Third Round | Match details |
| 3 | Spartak Moscow | 08-08-2018 | Third Round | Match details |
| 3 | FC Basel | 01-08-2018 | Second Round | Match details |
